Materials Literature
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Abstract By using an arylthiolate ligand with a substituent in the para ‐position, 4‐ t BuC 6 H 4 S − , the yellow silver‐thiolate complex {[HNEt 3 ] 2 n [Ag 8 Ag 4/2 (SC 6 H 4 t Bu‐4) 12 ] n · n C 2 H 5 OH} ( 1 ) has been synthesized and structurally characterized. Complex 1 is ionic composed of [HNEt 3 ] + cations a…
A super film: 2D sheet assemblies of alkylsilylated deoxyguanosine derivatives were formed by double intertape hydrogen bonding between hydrogen-bonded 1D tape motifs. Introduction of polar oxyethylene units at the sheet surface allowed the fabrication of a flexible, self-supporting supramolecular film (see figure) wi…
We investigated the crystalline structures of poly(vinylidene fluoride) (PVDF) in PVDF/silica (SiO 2 ) binary and PVDF/poly(methyl methacrylate) (PMMA)/SiO 2 ternary hybrid composite films using infrared (IR) analysis and solid-state, high-speed magic-angle-spinning (MAS) 19 F NMR spectroscopy. These hybrid films were…
Current interests in the chemistry of high-nuclearity transition- metal complexes draw from their utility in the emerging science of nanomaterials,[1] as models for the multimetal active sites of metal-storage proteins,[2] and as single molecule magnets (SMMs).[3,4] In addition, such super-sized molecules often show a…
Abstract The self‐assembly mechanism leading to the exclusive formation of a triple‐stranded bimetallic helicate upon reaction of Eu III with a ditopic hexadentate ligand L bearing two carboxylate moieties has been fully elucidated in water for a wide range of [Eu] tot /[L] tot ratios. Using a fruitful combination of…
We have studied the growth of epitaxial La2Zr2O7 thin films on (111) Si. Although the interface structure can be strongly affected by the Si oxidation during the deposition process, epitaxial growth of La2Zr2O7 was obtained. A detailed study by means of transmission electron microscopy reveals two types of structures…
We report the synthesis of rare-earth manganese-oxide-based nanotubes. The pore wetting technique was used to obtain structures of nominal composition La0.325Pr0.300Ca0.375MnO3 with 800 nm external diameter, 4000 nm length, and wall thickness below 100 nm exhibiting magnetic and magnetoresistive behavior below 200 K,…
Abstract The structures of three 1:1 composite compounds prepared with the polyoxometalate (POM) [PMo 12 O 40 ] 3− and the cations [Ln(NMP) 6 ] 3+ [Ln = La ( 1 ), Ce ( 3 ), Pr ( 2 ); NMP = N ‐methyl‐2‐pyrrolidone] exhibit two types of zig‐zag chains with alternating cations and anions through Mo−O t −Ln−O t −Mo links…
Based on the boron nitride thermodynamic equilibrium phase diagram, a thermodynamic analysis in nanoscale was proposed, with respect to the effect of nanosize-induced additional pressure on Gibbs free energy of critical nuclei of cubic boron nitride (c-BN), to elucidate nucleation of c-BN in a high-pressure and high-t…
The origin of perpendicular anisotropy in Co/Pd multilayers has been investigated. We examined this question by studying multilayers in which the total equivalent thicknesses of Co and Pd are kept constant, but in which the Co/Pd interface is progressively alloyed using codeposition of the two elements. The multilayer…
The relative dielectric constant of epitaxial BaTiO3 thin films deposited on MgO was determined over the frequency range from 0.05 to 40.05 GHz. Coplanar stripline waveguides were formed on the BaTiO3 films and the dielectric constant was determined by matching the reflection (S11-) parameter by measurement with that…
The limit of the Rayleigh scattering and total losses in silica fiber was determined from the results of the Rayleigh scattering and structural relaxation measurements. Annealing condition during fiber drawing was optimized, and much potential to reduce the Rayleigh scattering loss has been verified. Total loss can be…
First-principles density-functional theory (DFT) calculations of single-walled phosphorus nanotubes constructed from the black-phosphorus (b-P) layered allotrope show that their strain energies per atom for radii above 0.6 nm are comparable to the strain energies predicted for experimentally observed single-walled car…
A series of tetraalkynylplatinate(II) complexes, (NBu(4))(2)[Pt(Ctbd1;CR)(4)] (R = C(6)H(4)N-4, C(6)H(4)N-3, and C(6)H(3)N(2)-5), and the diynyl analogues, (NBu(4))(2)[Pt(Ctbd1;CCtbd1;CR)(4)] (R = C(6)H(5) and C(6)H(4)CH(3)-4), have been synthesized. These complexes displayed intense photoluminescence, which was assig…
Spinel ferrite CoCr x Fe 2 - x O 4 nanoparticles over a compositional range 0 < x < 1 were synthesized using a reverse micelle microemulsion method. This method provided excellent control over the composition and gave a reasonable size distribution. Upon increased Cr substitution, the blocking temperature, saturation…
The structural and morphological evolution of shear-induced crystallization precursors generated by pulling a single fiber through a thin layer of molten isotactic polystyrene (i-PS) has been spatially resolved by simultaneous small- and wide-angle X-ray microdiffraction in samples with different thermomechanical hist…
Dihydrofolate reductase (DHFR) has several flexible active site loops that facilitate ligand binding and catalysis. Previous studies of backbone dynamics in several complexes of DHFR indicate that the time scale and amplitude of motion depend on the conformation of the active site loops. In this study, information on…
Water-soluble polyphosphazenes emerge as an important class of biologically active macromolecular compounds dictating the need for the development of their well-defined and controlled synthesis. The synthetic pathway leading to biologically active polyphosphazenes involves preparation and chemical transformation of in…
The charge density distribution has been determined for a transition metal cyanide, RbMn[Fe(CN)(6)], by means of the maximum entropy-Rietveld method combined with the highly angularly resolved synchrotron radiation x-ray powder diffraction at SPring-8 BL02B2. We directly observed a charge transfer from the Mn site to…
Reduction of the interfacial friction for the contact of a silicon oxide surface with sodium borosilicate in aqueous solutions has been accomplished through the adsorption of poly(L-lysine)-graft-poly(ethylene glycol) on one or both surfaces. Spontaneous polymer adsorption has been achieved via the electrostatic attra…